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Genome-wide identification of loci modifying spike-branching in tetraploid wheat
- Source :
- TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik, TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik, vol 134, iss 7
- Publication Year :
- 2021
- Publisher :
- Springer Science and Business Media LLC, 2021.
-
Abstract
- Key message Genetic modification of spike architecture is essential for improving wheat yield. Newly identified loci for the ‘Miracle wheat’ phenotype on chromosomes 1AS and 2BS have significant effects on spike traits. Abstract The wheat (Triticum ssp.) inflorescence, also known as a spike, forms an unbranched inflorescence in which the inflorescence meristem generates axillary spikelet meristems (SMs) destined to become sessile spikelets. Previously, we identified the putatively causative mutation in the branched headt (bht) gene (TtBH-A1) of tetraploid wheat (T. turgidum convar. compositum (L.f.) Filat.) responsible for the loss of SM identity, converting the non-branching spike to a branched wheat spike. In the current study, we performed whole-genome quantitative trait loci (QTL) analysis using 146 recombinant inbred lines (RILs) derived from a cross between spike-branching wheat (‘Miracle wheat’) and an elite durum wheat cultivar showing broad phenotypic variation for spike architecture. Besides the previously found gene at the bht-A1 locus on the short arm of chromosome 2A, we also mapped two new modifier QTL for spike-branching on the short arm of chromosome 1A, termed bht-A2, and 2BS. Using biparental mapping population and GWAS in 302 diverse accessions, the 2BS locus was highly associated with coding sequence variation found at the homoeo-allele of TtBH-B1 (bht-B1). Thus, RILs that combined both bht-A1 and bht-B1 alleles showed additive genetic effects leading to increased penetrance and expressivity of the supernumerary spikelet and/or mini-spike formation.
- Subjects :
- 0106 biological sciences
Technology
Plant Biology & Botany
Quantitative Trait Loci
Population
Locus (genetics)
Crosses
Quantitative trait locus
Biology
01 natural sciences
03 medical and health sciences
Genetic
Genetics
Additive genetic effects
Expressivity (genetics)
Inflorescence
Allele
education
Alleles
Crosses, Genetic
Genetic Association Studies
Triticum
030304 developmental biology
0303 health sciences
education.field_of_study
Agricultural and Veterinary Sciences
Human Genome
food and beverages
Chromosome Mapping
Chromosome
General Medicine
Biological Sciences
Tetraploidy
Phenotype
Original Article
Agronomy and Crop Science
010606 plant biology & botany
Biotechnology
Subjects
Details
- ISSN :
- 14322242 and 00405752
- Volume :
- 134
- Database :
- OpenAIRE
- Journal :
- Theoretical and Applied Genetics
- Accession number :
- edsair.doi.dedup.....4e3ea4af954b57b37ceadddd95ab0727